reproducible crash with amd64/SMP (with file system trouble)

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

Running 5.99.6 from 10 January, my system crashes reproducibly when
building apr from pkgsrc.  It has happened three different times.
Twice, fsck gave up because of duplicate i-nodes, so I had to run it
manually.  One of those times, fsck left things in an incorrect state:
a directory with no files in it had a link count of 3.  I had to reboot
into single user and rerun fsck to clear that one up.

When I boot with -1, I can build the package with no trouble.

The machine in question is a Thinkpad T61 with 3GB of RAM; per the
subject line, it's running amd64.  I've been holding off running
anything newer while Christos' time changes settle down, but if there
have been other changes in the last week or so that may have fixed it I
think I'll have to take my chances...

Please cc me directly on any responses; I've had to rejigger my mail
setup while my laptop is not fully functional, and I'm not sure I'll
see this mailing list properly.

-- 
                --Steve Bellovin, http://www.cs.columbia.edu/~smb